mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, glassy-to-dull luster, irregular fracture, and no obvious cleavage; Mohs hardness 7, with a trigonal crystal structure. The image shows a small rough piece, so identification is tentative.
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Physical properties
White to translucent, glassy-to-dull luster, irregular fracture, and no obvious cleavage; Mohs hardness 7, with a trigonal crystal structure. The image shows a small rough piece, so identification is tentative.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is found in rocks of many geological ages.
Uses & applications
Used in glass and ceramics, electronics, construction aggregate, and occasionally carvings or inexpensive jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals; its hardness lets it scratch ordinary glass.
Field identification & locations
Look for hardness near 7, glassy fracture surfaces, and lack of cleavage. Common worldwide in veins, pegmatites, and many rock types.
